Numerical Investigation of High Speed Boundary Layer Stabilization Through Porous Walls

Speaker: Christoph Hader, Ph.D. Candidate, University of Arizona
September 9, 2014

Presentation

Abstract

Laminar to turbulent transition in high-speed flows can proceed along several paths and is still not completely understood. The understanding of the transition process and the accurate prediction of the transition onset and the downstream extent of the transition region are crucial for high-speed vehicle design. Transition strongly increases the heat transfer and has strong implications for the design and weight of the thermal protection system. Thus, an improvement of understanding the transition process could provide guidance for the design of future high-speed vehicles. Previous studies have shown the potential of ultrasonically absorptive coatings (UACs) as a passive laminar flow control technique. In this work, the influence of porous walls on the linear and nonlinear stability regime of a Mach 6 Boundary Layer is investigated using temporal direct numerical simulations.

Biography

Christoph Hader is a doctoral student at the University of Arizona under the direction of Professor H.F. Fasel. Christoph received a B.S. equivalent degree at the University of Stuttgart (Germany) and a M.S. Degree at the University of Arizona. His research interests are high speed transition and higher order numerical methods.

Seminar Participation

Attending In Person

For select seminars, you may wish to attend in-person if you are in the vicinity of NASA Ames Research Center. These AMS seminars are held in Building N258 in Room 127, just off the front lobby. Sessions available to attend in-person will be indicated in the announcement information. In-person participants without NASA badges will need a valid visitor badge (US citizenship or permanent residency is required) to enter the facility.

Join Us Online

To attend an AMS seminar, click on the Microsoft Teams link in the seminar description. You can connect through the desktop Teams App if you have it, or you can select "Watch on the Web Instead" to enter the meeting as a guest. Please ensure that you've muted your microphone in Teams before you select "Join Now" to enter the meeting lobby.